EnglishContamination of hot water distribution systems by Legionella represents a great challenge due to difficulties associated with inactivating microorganisms, preserving the water characteristics. The aim of this study was to examine over the course of 1 year in 11 fixed sites, the impact of monochloramine disinfection on Legionella, heterotrophic bacteria (36°C), Pseudomonas aeruginosa contamination, and chemical parameters of a plumbing system in an Italian hospital. Three days after installation (T0), in the presence of monochloramine concentration between 1.5 and 2 mg/L, 10/11 sites (91%) were contaminated by L. pneumophila serogroups 3 and 10. After these results, the disinfectant dosage was increased to between 6 and 10 mg/L, reducing the level of Legionella by three logarithmic unit by 2 months postinstallation (T2) until 6 months later (T3). One year later (T4), there was a significant reduction (p = 0.0002) at 8/11 (73%) sites. Our data showed also a significant reduction of heterotrophic bacteria (36°C) in 6/11 (55%) sites at T4 (p = 0.0004), by contrast the contamination of P. aeruginosa found at T0 in two sites persisted up until T4. The results of the present study show that monochloramine is a promising disinfectant that can prevent Legionella contamination of hospital water supplies.
| Data di pubblicazione: | 2015 |
| Titolo: | Effect of monochloramine treatment on colonization of a hospital water distribution system by legionella spp.: A 1 year experience study |
| Autore/i: | Mancini, Benedetta; Scurti, Maria; Dormi, Ada; Grottola, Antonella; Zanotti, Andrea; Cristino, Sandra |
| Autore/i UNIMORE: | |
| Digital Object Identifier (DOI): | 10.1021/es506118e |
| Rivista: | |
| Volume: | 49 |
| Fascicolo: | 7 |
| Pagina iniziale: | 4551 |
| Pagina finale: | 4558 |
| Codice identificativo ISI: | WOS:000352659000066 |
| Codice identificativo Scopus: | 2-s2.0-84926442616 |
| Codice identificativo Pubmed: | 25723867 |
| Citazione: | Effect of monochloramine treatment on colonization of a hospital water distribution system by legionella spp.: A 1 year experience study / Mancini, Benedetta; Scurti, Maria; Dormi, Ada; Grottola, Antonella; Zanotti, Andrea; Cristino, Sandra. - In: ENVIRONMENTAL SCIENCE & TECHNOLOGY. - ISSN 0013-936X. - 49:7(2015), pp. 4551-4558. |
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